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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6-(1/n) = 6 // - 6
6-(1/n)-6 = 0
6-n^-1-6 = 0
-1*n^-1 = 0 // : -1
n^-1 = 0
n należy do O
n belongs to the empty set
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